Spark-gap.



1. KHLZ,

SPARK GAP. APPucATfoN mso ruLYze. 191s.

VPatented May 16, 1916 Il?) I separated by curved surfaces ANT OFFICE JACOB XIILZ, OF PROVIENCE, RODE ISLAND, ASSIG-NGR OF ONE-THIRD TO ROBERT J. MARTN, ONE-THIRD TG ROBERT J. PROHASKA, AND NE-THIRD TO DENNIS SPARK-Gar.

iasaoii.

To oll'waom it may concern Be it known that l, JACOB linnn, a citizen of the United States, residing at Providence, in the county ot Providence and State ot' Rhode Island, have invented certain new and useful Improvements in Spark-Gaps, of' Whichthe following is a speciiication.

My invention relates to spark gaps or similar attaclnnents to spark plugs and is purposed for those general objects characteristic to this type of structure.

. .ln addition to the above the essential objects of my invention are to afford a closer set of' the adjacent gap elements than has heretofore been possible; to accommodate these elements more closely to the relatively small actual voltage of the passing current, and to the variation in voltage due to whetherthe connection .happens to be from the dry cell battery or from the magneto; to prevent jumping ot the spark across the gap by centering the current at that point; to insure a maximum insulation thereby preventing short circuiting; to provide an ample air circulation around the contacts to prevent excessive heat, fusion. or oxidation ofthe parts; to prevent fracture of the glass wall by vibration; to improve the clamp connection; and to attain these objects in an inexpensive structure.

To the above ends my invention consists .in such parts and combinations of parts as fall within the scope of the appended claims. in the accompanying drawings which forni a part of this speciication, Figure 1 is a plan view of my novel gap, Fig. 2, a longitudinal section of the same on line 2-2 of Fig. i.' Fig. 3, a transverse section on line 3-3 of Fig. 1 and Figs. 4 and 3, oppositefend elevations ot' the same'.

Like reference charactersY indicate like parts throughout the views.

My device comprises two Caps 1 and 2 of insulating materiah the former comprises an end wall 3, and an inwardly directed peripheral flange 4. Integral with this cap and concentric thereto is asbody 5 of fiber or other insulating material preferably moldable. This bony or 5 core is substantially cylindrical except that it has plain surfaces 6 at diametrically opposite points 7 as shown in Fig. 3. i The core is provided with a central transversely disposed' opening 9, ex-

Specicaton of Letters Patent.

Patenten May 16, 1916.

.application lled July 26', 1915. Serial No. 42,047.

tending therethrough to the flat or plain surfaces 6. The cap and body has a central axial .opening 10 provided with threads 11S rlhis opening` extends from the outer face of the cap body to the transverse opening 9.

YIn alineinent with the opening 10 the body has an opening 13 provided with threads V14 and extending from the opening 9 to the end. face of the body. Abutting against this face is the wall 16 of the cap 2 provided with a peripheral flange 17. rl`his cap'is also of insulating material. A central threaded opening 19 .in the cap head 16 is in alineinent with the opening 13.

A ixed conductor 21 has threads 22 en. gaging the threads 11 of the body, while a rotary conductor 24 has external threads 25 engaging the threads 14 of the body, and in the threaded opening 19 of the cap 2,.

' The rod 24 has milled or knurled head 27 upon its outer end, and upon its projecting shank is threaded a lock nut 28 and a nut 29 adapted to engage therebetween a current conducting wire 30. Fixed to or integral .with a head 31 on the outer end of the. screw member 21, is a clip or clamp 32 comprising a flat-plate 33 provided with a deep curved marginal cavity 34 to which extends a'slot 35 forming flat curved resilient furcations of fingers 36 vadapted to clasp the rial ofthe spark plug to which mydevice applied. j n

The adjacent inner endsot' the screw members or threaded rods 21 and 24 are riait, and carry iri chamber 9 concentrically located pins or projections 39 and 40, of

reduced dianeters in alinement with each;

other, and provided with flat end faces.

Rotatably mounted on the body 6 is a cylindrical transparent or glass shell or tube 41, of 'slightly less length than said body, and loosely overlapped by the flanges 4 and 17 of the caps. The Hat character of the opposite sides of the body, or its semi'- cylindrical character, combined with the cylindrical form of the shell :or tube 6 forms opposite longitudinal chambers 42 and 43 connected by the openingv 9.-

ln the wail 3 are air perforations or passages 45 and 46 extending to chambers 42 and 43 respectively; and in the wall 16 are similar passages 48 and 49'opening into the respective' chambers.

The parts assembled as described constitute a structure wherein the gap members are set by manually turning the head 27 whereby the element 40 on the movable mem bei' is caused to approach or recede from 4the element 3l ofthe relatively fixed or stationary member 2l. v

`It will be understood that the member 2l may be fixed in the body 6 in any'desired manner. The small diameter of the coperating projections and the flat character of their faces admit a close approach or set,

and their reduced diameter relatively to the carrying members 2l and 24 centers the current and prevents spark jumping. EX- cessive heat of and adjacent to projections or contacts 39 and 40 is prevented by the i ample air circulation passing through the air channels, the longitudinal chambers, and the ,transverse chamber 9.

The rotary and slidable character of the transparent shell 4l prevents the fracture thereof by the vibration of the object carrying the gap structure The clip or'clamp ing member 32 makes it possible to engage the structure to a plug rod without auxiliary'nuts, if desired. What I claim is:-

l. In a spark gap, .the combination of a cylindrical insulating body provided with oppositely disposed plane side faces and with a transverse chamber extending through the body to the planefaces, a cylindrical glass shell surrounding the body and forming with the plane faces longitudinal chambers, caps upon the ends .of the body provided with perforations leading to the longitudinal chambers, conductors in the body extending into the transverse chamtors in the body extending into the trans` verse chamber, and spark projections upon the conductors.

3. In a spark gap, the combination of an insulating body provided with a transversely disposed chamber extending through the body, a shell surrounding the body and forming in conjunction therewith longitudinal chambers communicating with the first chamber, and caps upon the body 'provided with perforations communicating with the longitudinal chambers.

In testimony whereof I' have affixed niy signature in presence of two witnesses.

JACOB KIILZ.

-Witnesses:

I. C, LowENs'rniN, ELEANOR Gow. 

